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Destabilizing a seiche with an movable dam.

Hélène Scolan 12/2009

Volcanic tremors are seismic signals emanating from
uid channels encased in rock. The
understanding of the mechanism of this phenomenon is of great importance to improve
evaluation of volcanic eruptions. Many possibilities have been advanced to understand the
mechanism responsible for these low-frequency signals.
It has been suggested recently that the seismicity could be the result of
owdestabilized
oscillations whose frequency is set by an adjacent reservoir in the rock. Thus,
the channel in the rock would act like a clarinet reed exciting and interacting with standing
waves in an adjacent reservoir.